Adding additional infomation to Python Exceptions

Question

Python noob question that's not easy to Google. Coming from C++ I'm still coming to grips with what can be done in Python.

I want to raise an exception in Python and add a number and string value to the exception. The exception must be a standard Python exception, not a custom one. I was planning on using RuntimeError.

So, can I add a number and string value to RuntimeError?

(Edit: Why don't I just use a custom exception? I tried! See Python: Referring to an Exception Class Created with PyErr_NewException in an Extension Module)

I feel like it could be a duplicate of this: stackoverflow.com/questions/9157210/… — sashkello
– sashkello, Commented Nov 12, 2013 at 0:24
You can subclass Exception class for your own types of exceptions, where you can add any additional information. — unixmin
– unixmin, Commented Nov 12, 2013 at 1:05
@sashkello I don't think it's a duplicate of that question because that question just uses a string. I think the exception classes usually accept a string as part of their definition. I am asking about adding arbitrary extra data. — bluedog
– bluedog, Commented Nov 12, 2013 at 1:18

John Spong · Accepted Answer · 2013-11-12 00:27:22Z

1

You can, and it will be stored in the args attribute

>>> try: 
...     raise RuntimeError('test', 5)
... except Exception as e:
...     print e.args
...
('test', 5)

I would think twice about your restriction against creating your own exception type; proper exception types are extremely important.

answered Nov 12, 2013 at 0:27

John Spong

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Robᵩ · Accepted Answer · 2013-11-12 00:27:13Z

1

The initializer for RuntimeError takes an arbitrary set of arguments. Like this:

if temp < 0:
    raise RuntimeError(temp, "Wicked Cold")

answered Nov 12, 2013 at 0:27

Robᵩ

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